Albeet ball



UNITED STATES PATENT OFFICE- ALBERT BALL, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO THE SULLIVAN MAGHIN E COMPANY, OF SAME PLACE.

DRILL CHANNELlNG-MACHINE'.

SPECIFICATION forming part of A Letters Patent No. 374,818, dated December 13, 1887.

Application filed February 15, 1887. Serial No. 228,050. (No model.)

.To all whom it may concern.-

Be it known that I, ALBERT BALL, of Claremont, in the county of Sullivan and State of New Hampshire, have invented a new and Improved Drill-Holder for Gang-Drill Channeling-Machines; and I do hereby declare that the following-is a full and exact description of shall be in the same line, and are put in and taken out, when desired, without hammering.

My arrangements, I claim, obviate the expensive breakages and delays incident to the devices heretofore applied.

For a more thorough understanding of my invention in detail attention is invited to the accompanying drawings, in which Figure 1 is a front vertical view of the holder, and shows the piston, piston-rod, the main head-piece of the holder, (which is keyed. to the piston-rod and wherein are the various steel drills,) and the clamps for holding the drills, excepting the upper clamp-piece, Fig. 3, which is left off in order to show the simple way of adjusting the individual drills to common or desired length by means of blocking. The front part of the clamp is made in two pieces, so as to facilitate this method of blocking. Fig. 2 is a top view of the clampingsleeve used near the lower ends of the drillrods to keep them from spreading laterally. Fig. 3 is afront view of the upper clamp shown without the screw-bolts. Fig. 4 is a back view ofthemain head-pieceoftheholder. (Thefront view is shown in Fig. 1.) Fig. 5 is a lower end view of the main head-piece with the clamps and showing the receptacle for the gang of drills. Fig. 6 is a latitudinal view of the connection-piece which keeps in its proper place the clamping-sleeve (I) shown in Fig. 2.

.der which forms an abutment, K, for the top ends of the drills, so, that the bearing of the drills will come in a plane with the center of the piston, and leaving on the one side of the drills a shoulder, E. The cap-pieces F and G of the clamp (whichI make two in number, for the reason above stated) furnish, when in place, the corresponding shoulder, E, on the other side of the drills. (See Fig. 5.) The back of thebody of the clamp, Fig. 4, is solid, except for the several holes for clamp-bolts and screws H, h, and h. These bolt-holes on the'side where is the shoulder E are preferably made the size that the bolts will closely fit, as there is no occasion to move them in shifting gangs of drills.

- On the other side of the main head-piece I preferably use screws instead of bolts with nuts, and for the following reasons: On this side they have to be taken out in order to remove the gang of drills, and in practical work in this way I save'much time. Heretofore the objection to use of screws has been that the thread in the clamp gets worn and spoiled. I have invented a cheap way to obviate this by the use of a threaded tapering I bushing, P, Fig. 5, which can be driven into the holes in the back of the clamp D, made tapering to receive-them. When the thread of one of these is worn, the bushing can be quickly driven out and replaced. The shoulders d dare projections for guides in the working of the drill. The bolt-holes in the two clamps F and'G are made, as shown in Fig. 3 as to F, (see HZ) free and oblong, so as to allow of the easy lateral movement of the clamps, as hereinafter shown.

On the back of the body of the clamp, on two sides of each of the boltholes, I place lugs, so as to keep the bolt-heads from turning when once in place.

I (see Figs. 1 and 2) is a clamping-sleeve to prevent the drills from spreading at the cutting-points. It is held in its place from slipping up or down by the connection-piece J, which is clamped and held in with the gang of drills. This piece J has shoulders J tohold the clamping-sleeve from any movement relative to the drills either up or down, and a wedge, L, binds the drills and the connection-piece firmly together in the clamping-sleeve I.

I have found by practical experiment that it is of great importance that there should be something of a semi-elastic nature between the drills and the clamping-sleeve I to cushion the jar of theblow. I find, further, that hard wood is a cheap and effective material for the purpose, and the result is accomplished by making the wedge L of hard wood. The like result could of course be accomplished by in.- terposing a strip of wood between the drills and a metal wedge, or between the drills, or between the outside drill or holder, J, and the clamping-sleeve I. This clamping-sleeve is made thinner than the projections of the cutting-edges of the steel drills, so that there is a free clearance for it in the rock out.

M M M, Figs. 1, 3,.and 4, are setscrews, which, when the gang of drills is in place, serve to draw the shoulders E toward the shoulder E, and thereby to firmly clamp edgewise the gang of drills at their top end and prevent them from lateral motion. By screwbolts h h h on the one side (these bolts need not be removed in changing gangs) and screws h h h on the other side (these screws are removed in changing gangs) the gang is firmly clamped flatwise.

'N N N N N w represent the drill-rods, (I show five, but the number may be less or more,) which may have different shaped points, as desired, and which constitute the gang, and z z z z are different lengths of blocks, which are placed at the top ends of the individuals of the gang when varying in length, so that they may be all of a desired length when at work, and so that there is a uniform bearing against the abutment K.

The cuttingedges can be brought to any desired position in or out of line by means of a variety of blocking.

Heretofore in the various forms of steeldrillchanneling machines as invented and used the gangs of drills have been held by a clamp, so as to be at one side of the engine-piston when not altogether away therefrom, instead of being, as in my arrangement, in the same plane with the central working-line of the piston. In mine, too, the drill-rods, clamp, pistonrod, and piston constitute,practically,when at work, one straight working -drill, and side strains, jars, and spring motions are thereby avoided.

By my method of arranging the clamp-pieces blockings are easily put in when changing gangs. In practical work a gang of drills is changed as follows: The new gang is made up while the drill is at work, so as to avoid delay.

.whole is a plane figure.

This is done upon a metal or wooden former in the following way: The drills, together with a connection-piece J, of the proper length, are placed in the clampingsleeve I in the pS1l3 l0IlS desired, and the wedge L is then lightly driven in. Blocks 2 are placed at the top ends of any individuals of the gang requiring them, so as to bring them on a line at the top. The new gang being'ready, the set-screws M M are loosened, the nuts h on the screw-bolts h (but without the bolts) and the screws h are removed, and the clamp cap-piece F is taken ofi and any blockings removed, and then the clamp cap-piece G is removed. The dulled gang and connection-piece are'then taken out I by first moving them to one side until away from the abutmentand then lifting them away.

The. new gang can be then put in place by reversing the operation, the blocking being 1nserted after the clamp cap-piece G is lightly fixed in place, but before the piece F is put on.

It is obvious that the connection-piece J could be secured to the clamping-sleeve I by some other device than the shoulders J that would perform the same function, but in a less simple manner.

It is also obvious that the benefit of having the drills and their top bearing in the elamp'and the central line of the piston 1n a single plane will be gained more and more completely the nearer the central line of the Variations therefrom will gain the results more or less approximately.

My aim is to have the center line of the driving-piston the center line (both ways) of the gang of drills.

Having now described my invention, what I claim, and desire to secure by Letters Patent, is as follows:

1. In a drill-holder for a gang-drill channeling-machine,the combination, with a directacting piston, of a clamp consisting of the head-piece D,connected to the piston-rod, and having a recess on one side to receive the drills, an abutment, K, for the upper ends of the drills, which abutment is in a plane with the center of the piston, and a front com-, posed of two parts, F and G, removably secured to said head piece one above the other, substantially as and for the purposes set forth.

2. In a drill-holder for a gang-drill channeling-machine,the combination, with a directacting piston, of a clamp keyed to the pistonrod and consisting of the head-piece D, having an abutment, K, for the upper ends-of the drills, and a shoulder, E, for one side of the drills, and a front composed of two parts, F and G, each having a shoulder, E, for the other side of the drills and removably secured to said head-piece one above the other by bolts and screws, substantially as and for the purposes set forth.

3. A drill-holder for a gang-drill channeling-machine operated by a direct-acting piston and consisting of the main head-piece D,

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keyed to the piston-rod, and having an abutment, K, for the upper ends of the drills, a shoulder, E, for one side of the drills, and a pair of guide-shoulders, d 61, and a front eomposed of two removable parts, F and G, each having a shoulder, E, for the other side of the drills, and set-screws M M M, substantially as and for the purposes set forth.

4. In a drill-holder for a gang-drill channeling-machine, a clamp consisting of a main head-piece, D, with an abutment, K, and a shoulder, E, and a front removable in parts F G, with shoulders E and set-screws M M M, in combination with a direct-acting pistonrod, B, to which the clamp is keyed, substantially as herein described.

5. In a drill-holder for a gang-drill channeling-machine, the screw h, for drawing together the parts of the clamp, in combination with the removable threaded bushing P, substantially as described.

6. In a dri1l-holder for a gang-drill channeling-machine,the combination,with aclamping-sleeve, I, fitted over the drills near theircutting-edges and adapted to follow them into the channel", of a wedge or strip ofhard wood or other semi elastic material employed as a semi-elastic binder for the drills in said clamping-sleeve, substantially as described.

7. In a drill-holder for a gang-drill channelingmachinethe combinatiomwitha clamping-sleeve, I, fitted over the drills near their cutting-edges and adapted to follow them into the channel, of the clamping-sleeve holder J, provided with shoulders J, and awedge or strip of hard wood or other semi-elastic material employed as a semi-elastic binder for the drills in said clamp, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT BALL. XVitnesses:

O. BELLE DUTTON, FRANK A. BALL. 

